Fortress of the Muslim, Invocations from the Quran & Sunnah is a very beautiful booklet which consists of many authentic Dua’s (supplications) for a Muslim to supplicate on a daily basis and on specific occasions. This book is an abridgment of the Shaikh's earlier work entitled: الذكر والدعاء والعلاج بالرقى من الكتاب والسنة. Az-Zikr wad du'a wal 'ilaaj birruqa minal kitaab was-sunnah. In order to make it small and easily portable, he has chosen the section on words of remembrance only. It is a best seller in the category of Duas and Supplications.